From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9BFBC32792 for ; Mon, 30 Sep 2019 23:09:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4D382086A for ; Mon, 30 Sep 2019 23:09:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=wavecomp.com header.i=@wavecomp.com header.b="MZrdaIia" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732697AbfI3XI7 (ORCPT ); Mon, 30 Sep 2019 19:08:59 -0400 Received: from mail-eopbgr690119.outbound.protection.outlook.com ([40.107.69.119]:48448 "EHLO NAM04-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732660AbfI3XIx (ORCPT ); Mon, 30 Sep 2019 19:08:53 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=TLr8so0oI8rBkho2fAAW6o1i5qaHKxgu4MT2KwYwu3D/rv59kLS/QdTUobncKJeLbi2Lkd+CzuWmLtv5NGa85R19ugViF7yuU4xaSZxJe3gc+Fxc2vGXeCHvG2E5maBKelcZLy+RcezOnv80mOw+qZaoIIZYS3wDixlCuAqGIMaSqa9R9hbMTcb1quKvdZ1L2nU7EK+4h3yX9kbaJEzdVwKFROSSfpXVK1yUXOVairn1+XWoagY1qQoNyIxneh0d1mHd8LkLO4ILWp7isMxb4WMPuulVRz6dt6XiPDqqtmxRzJMUMaKuy7hj0YXIFKcRz+2ubAnM26KetCUhTuNJVw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=y6hL1v6jV4BHoMLK6wrVGnQWkPUvOe+a6kzlMbdv42s=; b=WQScYYcrhmDTa4um38C+Y7bscVEMh2BVnEF73XS8Fjn74iYbHGxeeFeiJq9XtKBTLscjfZ7ezh8RozViBGJl30RaKNYFmCecpkZmS62CSlt7uEVWXWxATcSXgwY4/SJ+D60IDBkBWg3ieI3cVC8Nx1qJMydnuVoLHfyRyxq6aoJ2JcHp50Lh8fqHzjQOs8lu5eLyCdekRuH8oTVNDAg4TqBwNZzSFaEGgQE2OQIY+vcbOeJ+3fVKczI8VpM6eWXEpcuyCb8ygoAr49QDRia8psKnOaPuWNu3OgdfmcctdsxFKEclYW4a33mbYkJhdRj7XXcypXp6936sTD0ek2Y1Mg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=wavecomp.com; dmarc=pass action=none header.from=mips.com; dkim=pass header.d=mips.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wavecomp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=y6hL1v6jV4BHoMLK6wrVGnQWkPUvOe+a6kzlMbdv42s=; b=MZrdaIiagRQ8hLKTf8kC2n/GpW7GWCzjvX0byNR7GQDqpBLEWkS4mCuIrf9mRBb2mLfze+m61iaJbDcMy6R7XEFfFx7V6IBUXTUtRviqCOKgiPQrMQF4XtpUP9EmMdXcUkkfGj8YCiy8a8MLNrEf3fBEMPohYbXNL2umeyexrUU= Received: from MWHPR2201MB1277.namprd22.prod.outlook.com (10.172.60.12) by MWHPR2201MB1022.namprd22.prod.outlook.com (10.174.167.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2305.17; Mon, 30 Sep 2019 23:08:35 +0000 Received: from MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::498b:c2cd:e816:1481]) by MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::498b:c2cd:e816:1481%2]) with mapi id 15.20.2305.017; Mon, 30 Sep 2019 23:08:35 +0000 From: Paul Burton To: "linux-mips@vger.kernel.org" CC: Huacai Chen , Jiaxun Yang , "linux-kernel@vger.kernel.org" , Paul Burton Subject: [PATCH 24/37] MIPS: bitops: Avoid redundant zero-comparison for non-LLSC Thread-Topic: [PATCH 24/37] MIPS: bitops: Avoid redundant zero-comparison for non-LLSC Thread-Index: AQHVd+P8A0ilHb6j/UC44m7h7ENk2w== Date: Mon, 30 Sep 2019 23:08:35 +0000 Message-ID: <20190930230806.2940505-25-paul.burton@mips.com> References: <20190930230806.2940505-1-paul.burton@mips.com> In-Reply-To: <20190930230806.2940505-1-paul.burton@mips.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR21CA0006.namprd21.prod.outlook.com (2603:10b6:a03:114::16) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:18::12) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.23.0 x-originating-ip: [12.94.197.246] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 9e77b366-0363-47ad-5390-08d745fb1ecc x-ms-traffictypediagnostic: MWHPR2201MB1022: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:883; x-forefront-prvs: 01762B0D64 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(39850400004)(346002)(396003)(376002)(136003)(366004)(189003)(199004)(14454004)(256004)(6512007)(81166006)(316002)(81156014)(44832011)(2351001)(486006)(476003)(6916009)(14444005)(186003)(478600001)(2501003)(6436002)(50226002)(8676002)(11346002)(8936002)(2616005)(5640700003)(66946007)(6486002)(42882007)(64756008)(66446008)(66476007)(66556008)(446003)(6506007)(1076003)(305945005)(386003)(52116002)(7736002)(102836004)(2906002)(71190400001)(71200400001)(36756003)(5660300002)(26005)(4326008)(66066001)(54906003)(25786009)(76176011)(107886003)(99286004)(6116002)(3846002);DIR:OUT;SFP:1102;SCL:1;SRVR:MWHPR2201MB1022;H:MWHPR2201MB1277.namprd22.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: wavecomp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: xHQy0NF4YL96/8yitOFmgspi7YEhptGFiU31hBTp3A/c8ncOKW0X3hdp2YKQvVu29uWZ6hgFzdl7CaUPGMVHeLSFWTg6kMWchq1WlN7h4LtgXPhAlTOALbRmgBmqg2x5k582r+8KHW1FPFrlv+a0NtjZmIRQLjNPw0izcIPneQJiNz5UG+DY0vJdnc6E0c0GHPRGxYIRl7dWM9spivLS6Hjtao9J9ETtTwO5ZdgWMfYjpI1AM1/5bdPQPzEfmiLVZfDk4U7jjwJZ1nwmElq1NN66q+YHp1muPMUj0nJEFS7noOFww4Nc0YEHuK68Vq/wmDAlRHMk7DY/beXBViLHY/i9JVPZ6WQQLwacXcdVmV63cesM44/rhsAgKuBF8oEdqaUK28nUE/tvyzAwR3fslvIOIzRs4OcEqw3FL48kNuM= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9e77b366-0363-47ad-5390-08d745fb1ecc X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Sep 2019 23:08:35.3418 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: eSMvfZnXdp8Zc+ztQTN1UMPEd2Jxv9BO+lnFSqysiE8j+rrEC4TUWss78A5NcHLnr2fl6RIaF9QlXaDKCwYOqw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1022 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The IRQ-disabling non-LLSC fallbacks for bitops on UP systems already return a zero or one, so there's no need to perform another comparison against zero. Move these comparisons into the LLSC paths to avoid the redundant work. Signed-off-by: Paul Burton --- arch/mips/include/asm/bitops.h | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.= h index 35582afc057b..3e5589320e83 100644 --- a/arch/mips/include/asm/bitops.h +++ b/arch/mips/include/asm/bitops.h @@ -264,6 +264,8 @@ static inline int test_and_set_bit_lock(unsigned long n= r, : "=3D&r" (temp), "+m" (*m), "=3D&r" (res) : "ir" (BIT(bit)) : __LLSC_CLOBBER); + + res =3D res !=3D 0; } else { loongson_llsc_mb(); do { @@ -279,12 +281,12 @@ static inline int test_and_set_bit_lock(unsigned long= nr, : __LLSC_CLOBBER); } while (unlikely(!res)); =20 - res =3D temp & BIT(bit); + res =3D (temp & BIT(bit)) !=3D 0; } =20 smp_llsc_mb(); =20 - return res !=3D 0; + return res; } =20 /* @@ -335,6 +337,8 @@ static inline int test_and_clear_bit(unsigned long nr, : "=3D&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=3D&r" (res) : "ir" (BIT(bit)) : __LLSC_CLOBBER); + + res =3D res !=3D 0; } else if ((MIPS_ISA_REV >=3D 2) && __builtin_constant_p(nr)) { loongson_llsc_mb(); do { @@ -363,12 +367,12 @@ static inline int test_and_clear_bit(unsigned long nr= , : __LLSC_CLOBBER); } while (unlikely(!res)); =20 - res =3D temp & BIT(bit); + res =3D (temp & BIT(bit)) !=3D 0; } =20 smp_llsc_mb(); =20 - return res !=3D 0; + return res; } =20 /* @@ -403,6 +407,8 @@ static inline int test_and_change_bit(unsigned long nr, : "=3D&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=3D&r" (res) : "ir" (BIT(bit)) : __LLSC_CLOBBER); + + res =3D res !=3D 0; } else { loongson_llsc_mb(); do { @@ -418,12 +424,12 @@ static inline int test_and_change_bit(unsigned long n= r, : __LLSC_CLOBBER); } while (unlikely(!res)); =20 - res =3D temp & BIT(bit); + res =3D (temp & BIT(bit)) !=3D 0; } =20 smp_llsc_mb(); =20 - return res !=3D 0; + return res; } =20 #include --=20 2.23.0